I have been using the hotlead program for downloading from emusic.com.
It is available from http://www.arcaner.com/hotlead.shtml .
It works with the new emp format. There is also a utility, emp2m3u,
that converts emp files to m3u files and plays them on xmms,
I have no experience with this utility, but it is available at
http://davido.ouvaton.org/emp2m3u/ .
These results came from a freshmeat.net search using emusic as the
search term.
Tony